在一定磨损条件下，中硬度钢比高硬度钢耐磨。
Under certain wear condition the wear resistance of 45 steel with medium hardness is higher than that with high hardness.
在触诊中，医生能够感受到组织的外形及硬度。
In palpation, a doctor feels the shape and firmness of tissue.
固化后硬度高、亮度高、施工简单、经济实惠，制作过程中无需表面覆膜。
High hardness after cure, high brightness, easy and economical to operate, no need of membranes.
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